Effect of Crystal-Field Splitting and Inter-Band Hybridization on the Metal-Insulator Transitions of Strongly Correlated Systems

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dc.creatorPoteryaev, Alexander I.
dc.creatorFerrero, Michel
dc.creatorGeorges, Antoine
dc.creatorParcollet, Olivier
dc.date2008-01-28
dc.date2008-07-03
dc.date.accessioned2026-07-07T09:52:45Z
dc.date.available2026-07-07T09:52:45Z
dc.descriptionWe investigate a quarter-filled two-band Hubbard model involving a crystal-field splitting, which lifts the orbital degeneracy as well as an inter-orbital hopping (inter-band hybridization). Both terms are relevant to the realistic description of correlated materials such as transition-metal oxides. The nature of the Mott metal-insulator transition is clarified and is found to depend on the magnitude of the crystal-field splitting. At large values of the splitting, a transition from a two-band to a one-band metal is first found as the on-site repulsion is increased and is followed by a Mott transition for the remaining band, which follows the single-band (Brinkman-Rice) scenario well documented previously within dynamical mean-field theory. At small values of the crystal-field splitting, a direct transition from a two-band metal to a Mott insulator with partial orbital polarization is found, which takes place simultaneously for both orbitals. This transition is characterized by a vanishing of the quasiparticle weight for the majority orbital but has a first-order character for the minority orbital. It is pointed out that finite-temperature effects may easily turn the metallic regime into a bad metal close to the orbital polarization transition in the metallic phase.
dc.description12 pages, 10 figures One figure added. Text revised according to PRB proof. Appear in PRB 72
dc.identifierhttps://arxiv.org/abs/0801.4356
dc.identifierhttp://arxiv.org/abs/0801.4356
dc.identifierPhys. Rev. B 78, 045115 (2008) (11 pages)
dc.identifierdoi:10.1103/PhysRevB.78.045115
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/165707
dc.subjectStrongly Correlated Electrons
dc.titleEffect of Crystal-Field Splitting and Inter-Band Hybridization on the Metal-Insulator Transitions of Strongly Correlated Systems
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